NFSクライアントにリモートNFS共有をマウントできません。

NFSサーバー（CentOS）から：

[root@localhost ~]# cat /etc/exports

/IT_Projects 192.168.56.0/25(ro,root_squash)

eth1      Link encap:Ethernet  HWaddr 08:00:27:C4:A8:B6  
          inet addr:192.168.56.101  Bcast:192.168.56.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fec4:a8b6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1790 errors:0 dropped:0 overruns:0 frame:0
          TX packets:230 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:252381 (246.4 KiB)  TX bytes:27381 (26.7 KiB)

NFSクライアント（CentOS）から：

 eth1      Link encap:Ethernet  HWaddr 08:00:27:C4:A8:B6  
              inet addr:192.168.56.102  Bcast:192.168.56.255  Mask:255.255.255.0
              inet6 addr: fe80::a00:27ff:fec4:a8b6/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:1609 errors:0 dropped:0 overruns:0 frame:0
              TX packets:145 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:231539 (226.1 KiB)  TX bytes:11555 (11.2 KiB)


[root@localhost ~]# mount -t nfs4 192.168.56.101:/IT_Projects /mnt/proj

接続タイムアウトが発生します。

[root@localhost ~]# dmesg | tail
sf_read_super_aux err=-71
sf_read_super_aux err=-71
sf_read_super_aux err=-71
fuse init (API version 7.16)
FS-Cache: Loaded
FS-Cache: Netfs 'nfs' registered for caching
EXT3-fs (sdc2): error: no journal found. mounting ext3 over ext2?
Installing knfsd (copyright (C) 1996 [email protected]).
NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
NFSD: starting 90-second grace period

[root@localhost ~]# ping 192.168.56.102
PING 192.168.56.102 (192.168.56.102) 56(84) bytes of data.
64 bytes from 192.168.56.102: icmp_seq=1 ttl=64 time=0.422 ms

クライアントはサーバーからpingを送信できます。

SELinuxをオフにして、NFSクライアントとサーバーでrpcbind、nfs、デーモンを起動しました。また、サーバーの/etc/nfsmount.confでDefvers = 3を変更しましたが、効果はありませんでした。この問題を解決するために他のどのような方法を探すことができますか？

    [root@localhost ~]# rpcinfo -p 192.168.56.101
rpcinfo: can't contact portmapper: RPC: Remote system error - No route to host

[root@localhost IT_Projects]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED 
ACCEPT     icmp --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh 
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited 

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited 

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination